These days you can't be too careful about what you download. A new Firefox add-on from Florian Queze called View Dependencies takes some of the guesswork out of knowing the content of a Web page, and the source of that content.
After you download the free add-on and restart Firefox, you'll see a Dependencies tab when you click Tools > Page Info to view information about the page that's currently open. The tab lists the files on the page, their URL, and their size. (Note that on at least one page I tested the file size was … Read more